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Press Release

Greater Scope with Knight Optical’s Germanium Windows

Date Announced: 08 Oct 2019

Renowned within the optical industry for first-class, on-spec optical components that meet the needs of a range of applications, Knight Optical has expanded its custom capabilities for Germanium Windows to meet an even greater range of specifications.

 Our premium-quality Germanium Windows are known for their longevity and durability. Capable of blocking UV and visible wavelengths yet permitting infrared from 2µm, transmission sits at over 45% between 2-14µm and up to 45°C. With our bespoke Anti-Reflective (AR) coatings, this can be significantly improved with an average of >85% at 3-12µm on AR/AR-coated Germanium. Furthermore, for ultimate scratch resistance, our Diamond-Like Carbon (DLC) coatings can be applied alongside AR options (AR/DLC) with an average transmission of >85% at 7-14µm.

 A relatively hard material, Germanium is often the material of choice for applications such as thermal imaging as well as Forward-Looking Infrared (FLIR) imaging systems and Fourier-Transform Infrared (FTIR) spectroscopy devices. What makes Germanium an even more sought-after material is its high refractive index. Compared to other typical infrared transmitters on the market, Germanium soars above alternative materials used for lens design. This, coupled with its low optical dispersion, high density and robust strength, has seen the material ascend in population amongst customers seeking reliable infrared optics. 

 Here at Knight Optical, not only do we stock a wide range of DLC/AR-coated Germanium Windows for 7-12µm, but we also offer a bespoke service. With the capability to provide custom-made optical components, we can mould our optics to meet the millimetre-perfect requirements of your project. If you are looking for a specific dimension, coating or tolerance, call our Technical Sales Team today to discover the details of our custom offering. 

 What's more, if you are looking for alternative Germanium options, we are also able to provide Lenses, Prisms and Blanks either from stock or as a custom-made option.

 To find out more about Knight Optical's wide range of Germanium Windows in custom-made and stock options, visit www.knightoptical.com

 Visit Knight Optical at SPIE Photonics West in San Francisco, California, at booth 2462 from 1st to 6th February 2020.


Since 1991, Knight Optical has been supplying premium optical components to a diverse range of industries such as the Defence, Security & Aerospace, Engineering & Manufacturing, Medical as well as Oil & Gas sectors – plus many more. As a brand built on excellence, Knight Optical prides itself on its high level of unparalleled quality and undertakes thorough inspection and testing of its optical components to guarantee compliance with the most complex of optical specifications. 


Knight Optical (UK) Ltd
Roebuck Business Park
Kent, ME17 1AB
Telephone: +44 (0)1622 859444
Fax: +44 (0)1622 859555
USA & Canada
Knight Optical USA LLC
1130 Ten Rod Road, Suite D-102
North Kingstown
Rhode Island 02852
Telephone: +1 401 583 7846

E-mail: mike.sharpe@knightoptical.com

Web Site: https://www.knightoptical.com

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